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http://dx.doi.org/10.11001/jksww.2016.30.4.391

A study on reducing scale formation on the RO membrane using carbon dioxide  

Pyo, Minsu (Department of Environmental Engineering, Daegu University)
Choi, Younggyun (Department of Environmental Engineering, Daegu University)
Publication Information
Journal of Korean Society of Water and Wastewater / v.30, no.4, 2016 , pp. 391-399 More about this Journal
Abstract
In this study, carbon dioxide ($CO_2$) was used as an inhibitor of scale production on the surface of RO membrane. In order to compare the effects of $CO_2$ injection on scale production, four RO modules: 1) without $CO_2$ injection and anti-scalant (RO module #1), 2) with only $CO_2$ injection (RO module #2), 3) with only anti-scalant (RO module #3), 4) with both $CO_2$ injection and anti-scalant (RO module #4), were operated for 60 days under constant flux mode. The trans-membrane pressure (TMP) was observed to decrease significantly in RO modules with $CO_2$ injection as compared with the other RO modules. When the feed water pH was controlled at 5.0 by injecting $CO_2$, the maximum TMP in RO modules #2 and #4 was founded to decrease by 42 and 40%, respectively. Moreover, the $Ca^{2+}$ concentration in the concentrate was 20mg/L lower in RO modules without $CO_2$ injection which is attributed to the scale formation on the surface of the RO membranes. The SEM-EDS analysis further showed a serious fouled RO membrane surface in RO modules #1 and #3.
Keywords
Anti-scalant; carbon dioxide ($CO_2$); fouling; RO membrane; scale; trans-membrane pressure;
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